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Finding the Fourth Proportional to 106.50, 159.88 and 90.57

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Solution

The fourth proportional to 106.50, 159.88 and 90.57 is: 135.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    106.50 : 159.88 = 90.57 : x
  2. Step 2: Convert to fraction form
    106.50/159.88 = 90.57/x
  3. Step 3: Cross multiply
    106.50x = 159.88 × 90.57
  4. Step 4: Simplify right side
    106.50x = 14,479.31
  5. Step 5: Solve for x
    x = 14,479.31/106.50
  6. Step 6: Final answer
    x = 135.96

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.